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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5831f86d376893c7dce5dfeb9ad3f5dbd6d6dcb95b43d85499e6b760b1cfa296' 
  AND token = 'HLP0urX8uZVcW7vE1q3JgdsVxDql809kh147QZnP+rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}